Master Chief Actor Says Halo 4 Almost Recast His Role And Cortana's With New Voice ActorsSteve Downes and Jen Taylor were briefly replaced in Halo 4, but testers' feedback led to their return after Downes auditioned again.
Halo x Helldivers Crossover Probably Never Happening, Arrowhead CEO SaysArrowhead's CEO Johan Pilestedt states it's unlikely Helldivers 2 will have a crossover with Halo.